Steven Hawking tried to destroy the universe by making Black holes destroy Physical information!
This put us all at tremendous risk and is generally considered by Quantum mechanics to be an evil act.
Good thing Mr. Hawking made a great comback and saved the universe:
The Euclidean path integral over all topologically trivial metrics can be done by time slicing and so is unitary when analytically continued to the Lorentzian. On the other hand, the path integral over all topologically non-trivial metrics is asymptotically independent of the initial state. Thus the total path integral is unitary and information is not lost in the formation and evaporation of black holes. The way the information gets out seems to be that a true event horizon never forms, just an apparent horizon.
Whew! that was a close one!